This Warhammer 40K Ultramarines Chapter papercraft is designed by daishiHUN. The Devastator Marines are Space Marines who serve in a Codex Astartes-compliant Space Marine Chapter's Devastator Squads. The Devastator Squad consists of a Sergeant and up to nine Battle-Brothers of whom four are designated as Heavy Weapons troopers. The Sergeant will be a Space Marine who has received extra training to equip him for his leadership role. Devastator Sergeants are also experts with all types of Space Marine Heavy Weapons although they prefer to fight with the standard Sergeant's weapons of Bolt Pistol and Chainsword or another melee weapon. This expertise means that the Sergeant can get the fullest tactical advantage from the weaponry he has at his disposal. Space Marines rely on the tactical acumen of individual Sergeants to avoid the need for complex command structures and communications networks.

The ten Battle-Brothers of a Devastator Squad fall into two groups. The first of these are the Heavy Weapons troopers. There may be as many as four Heavy Weapons troopers in the Squad. These Marines are armed with Heavy Bolters, Missile Launchers, Lascannons, Multi-Meltas or Plasma Cannons. These awesome weapons provide the squad with a host of alternative deployments and tactical uses. Inevitably the Devastator Squads are most commonly used to counter enemy armour or to penetrate defence points. They can also be used to provide fire support for infantry advances and to pin the enemy down with suprressive fire.

Some of the Battle-Brothers in a Devastator Squad may have fought enough battles to earn Veteran status. These Marines may continue to serve with the Squad for a short time but eventually they will be given special duties (such as in a Command Squad) or promoted to serve in the Chapter's elite First Company, which is comprised of Marines with Veteran status. In this way, the ranks of the Chapter's elite company are replenished. Veteran Battle-Brothers have white helmets, while Veteran Sergeants wear a white-striped red helmet. Following their tour of duty as Devastators, Space Marines generally join the ranks of the Assault Marines.

Devastator Squads have access to more types of Heavy Weapons than the other Space Marine Squad types. In addition to the familiar heavy Bolters, Lascannons and Missile Launchers they can also field the more exotic Multi-Meltas and Plasma Cannons. The latter fire a ball of superheated plasma that explodes on impact making it exceptionally potent against multiple targets. The Multi-Melta is a short-range anti-tank weapon, its thermal blast able to melt through even the toughest armour. A Devastator Squad's Missile Launchers can fire two different kinds of missiles. Frag missiles give effective fire against enemy infantry while Krak missiles are more useful against armoured targets. The missiles are relatively small and a Marine can easily carry sufficient numbers of both types to take full advantage of this dual tactical use in a battle.